SOLUTION: Number Set: 11, 9, 18, 24, 8, 14 - What number do you need to add to the set to make the mean equal to 15?

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Question 339195: Number Set: 11, 9, 18, 24, 8, 14
- What number do you need to add to the set to make the mean equal to 15?

Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(11+9+18+24+8+14+x)/7=15
84+x=15*7
84+x=105
x=21